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428
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1 /* syssignal.h - System-dependent definitions for signals.
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2 Copyright (C) 1992, 1993 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.30. */
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22
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440
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23 #ifndef INCLUDED_syssignal_h_
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24 #define INCLUDED_syssignal_h_
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428
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25
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26 /* In the old world, one could not #include <signal.h> here. The party line
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27 was that that header should always be #included before <config.h>, because
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28 some configuration files (like s/hpux.h) indicate that SIGIO doesn't work
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29 by #undef-ing SIGIO, and if this file #includes <signal.h>, then that will
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30 re-#define SIGIO and confuse things.
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31
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32 This was, however, a completely fucked up state of affairs, because on some
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33 systems it's necessary for the s/m files to #define things in order to get
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34 <signal.h> to provide the right typedefs, etc. And it's generally a broken
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35 concept for <config.h> to not be the very very first file included.
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36
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37 So instead of #undef'ing SIGIO in the various s/m files, I've changed them
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38 to define BROKEN_SIGIO instead, then we (syssignal.h) do an #undef SIGIO
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39 at the end, after including signal.h. Therefore, it's important that
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40 <signal.h> not be included after "syssignal.h", but that's the normal state:
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41 nothing should be directly including <signal.h> these days.
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42 -- jwz, 29-nov-93
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43 */
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44
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45 #include <signal.h>
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46 #include <errno.h>
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47
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48 /* SIGPOLL is the SVR4 signal. Those systems generally define
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49 SIGIO as an alias for SIGPOLL, but just in case ... */
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50
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51 #if defined (BROKEN_SIGIO)
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52 # if defined (SIGIO) && defined (SIGPOLL)
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53 # if SIGIO == SIGPOLL
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54 # undef SIGIO
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55 # undef SIGPOLL
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56 # else
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57 # undef SIGIO
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58 # endif
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59 # endif
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60 #else /* Not BROKEN_SIGIO */
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61 # if !defined (SIGIO) && defined (SIGPOLL)
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62 # define SIGIO SIGPOLL
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63 # endif
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64 #endif
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65
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66 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
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67 testing SIGCHLD. */
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68 #if defined (SIGCLD) && !defined (SIGCHLD)
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69 # define SIGCHLD SIGCLD
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70 #endif /* SIGCHLD */
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71
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72 #ifdef BROKEN_SIGCHLD
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73 #undef SIGCHLD
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74 #endif
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75
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76 #ifdef SIGCHLD
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77 #define EMACS_BLOCK_SIGCHLD EMACS_BLOCK_SIGNAL (SIGCHLD)
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78 #define EMACS_UNBLOCK_SIGCHLD EMACS_UNBLOCK_SIGNAL (SIGCHLD)
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79 #else
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80 #define EMACS_BLOCK_SIGCHLD
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81 #define EMACS_UNBLOCK_SIGCHLD
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82 #endif
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83
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84 /* According to W.R. Stevens __Advanced Programming in the Unix
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85 Environment__, there are four different paradigms for handling
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86 signals. We use autoconf to tell us which one applies.
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87
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88 Note that on some systems, more than one paradigm is implemented
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89 (typically, the POSIX sigaction/sigprocmask and either the older
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90 SYSV or BSD way). In such a case, we prefer the POSIX way.
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91
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92 NOTE: We use EMACS_* macros for most signal operations, but
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93 just signal() for the standard signal-setting operation.
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94 Perhaps we should change this to EMACS_SIGNAL(), but that runs
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95 the risk of someone forgetting this convention and calling
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96 signal() directly. */
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97
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98 #ifndef NeXT
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99 typedef SIGTYPE (*signal_handler_t) (int);
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100 #endif
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101
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102 #if defined (HAVE_SIGPROCMASK)
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103
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104 /* The POSIX way (sigaction, sigprocmask, sigpending, sigsuspend) */
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105
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106 signal_handler_t sys_do_signal (int signal_number, signal_handler_t action);
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107 /* Provide our own version of signal(), that calls sigaction(). The
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108 name is not sys_signal() because a function of that name exists in
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109 libenergize.a */
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110 #undef signal
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111 #define signal sys_do_signal
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112
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113 #define EMACS_BLOCK_SIGNAL(sig) do \
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114 { \
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115 sigset_t ES_mask; \
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116 sigemptyset (&ES_mask); \
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117 sigaddset (&ES_mask, sig); \
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118 sigprocmask (SIG_BLOCK, &ES_mask, NULL); \
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119 } while (0)
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120 #define EMACS_UNBLOCK_SIGNAL(sig) do \
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121 { \
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122 sigset_t ES_mask; \
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123 sigemptyset (&ES_mask); \
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124 sigaddset (&ES_mask, sig); \
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125 sigprocmask (SIG_UNBLOCK, &ES_mask, NULL); \
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126 } while (0)
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127 #define EMACS_UNBLOCK_ALL_SIGNALS() do \
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128 { \
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129 sigset_t ES_mask; \
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130 sigemptyset (&ES_mask); \
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131 sigprocmask (SIG_SETMASK, &ES_mask, NULL); \
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132 } while (0)
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133 #define EMACS_WAIT_FOR_SIGNAL(sig) do \
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134 { \
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135 sigset_t ES_mask; \
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136 sigprocmask (0, NULL, &ES_mask); \
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137 sigdelset (&ES_mask, sig); \
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138 sigsuspend (&ES_mask); \
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139 } while (0)
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140 #define EMACS_REESTABLISH_SIGNAL(sig, handler)
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141
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142 #elif defined (HAVE_SIGBLOCK)
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143
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144 /* The older BSD way (signal/sigvec, sigblock, sigsetmask, sigpause) */
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145
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146 /* It's OK to use signal() here directly. No unreliable signal
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147 problems. However, we use sigvec() because it allows us to
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148 request interruptible I/O. */
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149
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150 #define signal sys_do_signal
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151
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152 /* Is it necessary to define sigmask like this? */
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153 #ifndef sigmask
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154 # define sigmask(no) (1L << ((no) - 1))
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155 #endif
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156
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157 #define EMACS_BLOCK_SIGNAL(sig) sigblock (sigmask (sig))
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158 #define EMACS_UNBLOCK_SIGNAL(sig) sigsetmask (sigblock (0) & ~sigmask (sig))
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159 #define EMACS_UNBLOCK_ALL_SIGNALS() sigsetmask (0)
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160 #define EMACS_WAIT_FOR_SIGNAL(sig) do \
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161 { \
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162 int ES_mask = sigblock (0); \
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163 sigpause (ES_mask & ~sigmask (sig)); \
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164 } while (0)
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165 #define EMACS_REESTABLISH_SIGNAL(sig, handler)
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166
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167 #elif defined (HAVE_SIGHOLD)
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168
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169 /* The older SYSV way (signal/sigset, sighold, sigrelse, sigignore,
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170 sigpause) */
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171
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172 #define signal sigset
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173 #define EMACS_BLOCK_SIGNAL(sig) sighold (sig)
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174 #define EMACS_UNBLOCK_SIGNAL(sig) sigrelse (sig)
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175 /* #### There's not really any simple way to implement this.
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176 Since EMACS_UNBLOCK_ALL_SIGNALS() is only called once (at startup),
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177 it's probably OK to just ignore it. */
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178 #define EMACS_UNBLOCK_ALL_SIGNALS() 0
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179 #define EMACS_WAIT_FOR_SIGNAL(sig) sigpause (sig)
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180 #define EMACS_REESTABLISH_SIGNAL(sig, handler)
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181
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182 #else
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183
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184 /* The oldest SYSV way (signal only; unreliable signals) */
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185
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186 /* Old USG systems don't really have signal blocking.
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187 We indicate this by not defining EMACS_BLOCK_SIGNAL or
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188 EMACS_WAIT_FOR_SIGNAL. */
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189 #define EMACS_UNBLOCK_SIGNAL(sig) 0
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190 #define EMACS_UNBLOCK_ALL_SIGNALS() 0
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191 #define EMACS_REESTABLISH_SIGNAL(sig, handler) do \
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192 { \
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193 int old_errno = errno; \
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194 signal (sig, handler); \
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195 errno = old_errno; \
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196 } while (0)
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197
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198 /* Under SYSV, setting a signal handler for SIGCLD causes
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199 SIGCLD to immediately be sent if there any unwaited processes
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200 out there. This means that the SIGCLD handler *must* call
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201 wait() to reap the status of all processes -- it cannot
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202 simply set a flag and then reestablish the handler, because
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203 it will get called again, infinitely. We only need to
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204 worry about this on systems where signals need to be
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205 reestablished (SYSV Release 2 and earlier). */
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206 #define OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
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207
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208 #endif
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209
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210 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
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211 Must do that using the killpg call. */
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442
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212 #ifdef HAVE_KILLPG
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213 #define EMACS_KILLPG(pid, signo) killpg (pid, signo)
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428
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214 #else
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442
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215 #ifdef WIN32_NATIVE
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216 #define EMACS_KILLPG(pid, signo) kill (pid, signo)
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428
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217 #else
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442
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218 #define EMACS_KILLPG(pid, signo) kill (-(pid), signo)
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428
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219 #endif
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220 #endif
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221
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222 #ifndef NSIG
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223 # define NSIG (SIGUSR2+1) /* guess how many elements are in sys_siglist... */
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224 #endif
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225
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226 /* SYS_SIGLIST_DECLARED is determined by configure. On Linux, it seems,
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227 configure incorrectly fails to find it, so s/linux.h defines
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228 HAVE_SYS_SIGLIST. */
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229 #if !defined (SYS_SIGLIST_DECLARED) && !defined (HAVE_SYS_SIGLIST)
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442
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230 extern const char *sys_siglist[];
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428
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231 #endif
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232
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233 #ifdef SIGDANGER
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234 SIGTYPE memory_warning_signal (int sig);
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235 #endif
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236
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442
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237 #ifdef WIN32_NATIVE
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428
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238 /* Prototypes for signal functions, see nt.c */
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442
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239 typedef void (__cdecl *mswindows_sighandler) (int);
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240 mswindows_sighandler mswindows_sigset (int sig, mswindows_sighandler handler);
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241 int mswindows_sighold (int nsig);
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242 int mswindows_sigrelse (int nsig);
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243 int mswindows_sigpause (int nsig);
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244 int mswindows_raise (int nsig);
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245 #endif /* WIN32_NATIVE */
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428
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246
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440
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247 #endif /* INCLUDED_syssignal_h_ */
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